MA TURE 



[September 28, 1905 



GAIFFE IMPROVED 



WIMSHURST MACHINE. 



A Standard Instrument for Laboratory and 

 Research Work. Oives absolutely uniform con = 

 tinuous current for X = Rays, High Frequency, 

 Wave Current, &c. No enclosure (works in open 

 air), no spindle, no sectors. Plates are readily 

 detachable. 



Descriptive Pamphlet gratis on aonlication from the 

 Sole Agents for Great Britain and its Colonies — 



THE MEDICAL SUPPLY 

 ASSOCIATION, 



228 GRAY'S INN ROAD, LONDON, W.C., 



where the apparatus may be seen working. 



OX«,OSSIL.£2''Sr'S O-J^S E^I^CS-UKTESS^ 



RECENTLY 

 REMODELLED. 



Represents K and L 



types, giving- 3-5 H.P. 



and 5 H.P 



respectively. 



Immediate Delivery 



for Stock Sizes 



of Engines. 



CR.OSSr.E"V BROS. 



OI>EPJSH-A.-W, 



GREAT REDUCTION 

 GAS CONSUMED. 



Up to the end of 1904, 

 over 51,000 g-as and 

 oil eng-ines had been 



delivered, represent- 

 ing" about three- 

 quarters of a million 



actual horse-power. 



3Vi:.A.3NrCHESTBK. 



JX.TST i»xj:oil.ishe:i>. 



'Watsoxr's Ne^vw Price X^ist of Electro- 

 rrH.ex*a'peu.tica<l a,n<i I>ia,^nostic il.|c>pa.]:*a.ti;ts. 



The new edition is greatly enlarged, containing 108 

 pages fully describing and illustrating all standard and 

 many new instruments at reduced prices, with notes to 

 assist in the selection of apparatus. 



CORRESPONDENCE INVITED. 

 I*osf free (iiul >jratis on a/j/ilictifioii. 



W. WATSON & SONS, 313 High Holborn, London, W.C. 



Established 1837. 



Branches: 16 FORREST ROAD, EDINBURGH; 2 EASY ROW, BIRIVIINGHAIVI. 



THE NEW NATURALISTS' CAMERA. 



Reflex Focussing for Ordinary or 



Telephoto. Lenses. 



ILLUSTRATED PROSPECTUS FREE. 



a. H. I3A1L.1Li]VI:EYEFI, Ltd., 25 Newman St., LONDON, W. 



MAKERS OF THE CELEBRATED DALLM E YER LENSES. 



Printed by Richakd Clay and Sons, Limited, at 7 & S Bread Street Hill, Queen Victoria Street, in the City of London, .ind published by Macmillan 

 AND Co., Limited, at St. Martin's Street, London, W.C, and The Macmjllan Company, 66 Fifth Avenue, New Vorlc— Thursday, September 28, 1905 



